:root {
  --bg: #f9fafb;
  --bg-card: #ffffff;
  --text: #111827;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
}

[data-theme="dark"] {
  --bg: #111827;
  --bg-card: #1f2937;
  --text: #f9fafb;
  --text-muted: #9ca3af;
  --border: #374151;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, sans-serif;
  margin: 0;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background 0.15s;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.badge {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-green { background: #dcfce7; color: #15803d; }
.badge-yellow { background: #fef9c3; color: #92400e; }
.badge-red { background: #fee2e2; color: #991b1b; }
.badge-gray { background: #f3f4f6; color: #374151; }

.spinner {
  width: 1.5rem; height: 1.5rem;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.toast-container {
  position: fixed; bottom: 1.5rem; right: 1.5rem;
  display: flex; flex-direction: column; gap: 0.5rem;
  z-index: 9999;
}

.toast {
  padding: 0.75rem 1.25rem;
  border-radius: 0.5rem;
  color: #fff;
  font-size: 0.875rem;
  animation: slide-in 0.2s ease;
}
.toast-success { background: #16a34a; }
.toast-error { background: #dc2626; }
.toast-info { background: #2563eb; }
@keyframes slide-in { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

input[type="text"], input[type="password"], input[type="number"], textarea, select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
  color: var(--text);
  box-sizing: border-box;
}

label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 0.25rem; color: var(--text-muted); }

.nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.nav-link { color: var(--text-muted); text-decoration: none; font-size: 0.875rem; }
.nav-link.active, .nav-link:hover { color: var(--primary); }

.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
}

.modal { background: var(--bg-card); border-radius: 0.75rem; padding: 2rem; min-width: 400px; max-width: 600px; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.625rem 0.75rem; border-bottom: 1px solid var(--border); font-size: 0.875rem; }
th { color: var(--text-muted); font-weight: 600; }

.impersonation-banner {
  background: #dc2626; color: #fff;
  padding: 0.5rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 0.875rem; font-weight: 600;
}